You're not useless, you made a lot of sense in the reply to my thread and you helped my perspective on things a bunch I deal with depression also and know the exact feelings you're talking about. My only advice is don't be alone. The more I've spoke with family, especially my brother, the more it's helped me push through this. Don't be too concerned with your family being frustrated with you, frustration is a sign of love because they know you can do better, and you know you can do better as well.

One major thing that has helped me with my own depression is proving it wrong in the past, I'm struggling again with it now but trying to prove it wrong yet again. I've had those same thoughts, "I'm worthless; I can't do this; I shouldn't even try". I had to actually get to the point where I would be proving those thoughts wrong and almost laughing at them to myself. "How can I be worthless if I'm being successful; Hah, I thought I couldn't do THIS?". We build up these huge walls and negative thoughts about ourselves and that's exactly it, ourselves.

Wishing you lots of luck and if you ever need a shoulder to lean on, feel free to PM me